<html>
<head>
<style>
body {background-color: white; margin: 0;}
#o {width:100%; height: 100%; background-color: #DE640D;}
</style>
<script>
window.addEventListener('beforeunload', function() {
  var o = document.getElementById('o')
  o.parentNode.removeChild(o);
});
</script>
</head>
<body><div id='o'></div></body>
</html>
